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Browsing by Subject "Upper semicontinuous"

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Browsing by Subject "Upper semicontinuous"

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    Sandwich-type characterization of completely regular spaces 
    Gutiérrez García, Javier; Kubiak, Tomasz (Universitat Politècnica de València, 2007-10-01)
    [EN] All the higher separation axioms in topology, except for complete regularity, are known to have sandwich-type characterizations. This note provides a characterization of complete regularity in terms of inserting a ...
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    Transitions between 4-intersection values of planar regions 
    Bell, Kathleen; Richmond, Tom (Universitat Politècnica de València, 2017-04-03)
    [EN] If A(t) and B(t) are subsets of the Euclidean plane which are continuously morphing, we investigate the question of whether they may morph directly from being disjoint to overlapping so that the boundary and interior ...